Shipping Estimator and Shopping Cart Check Out

Our store offers 2 types of shipping.

In the product Item description I indicate which shipping type is used

Some items are indicated that they ship using UPS and the shipping weight is given to the buyer and has also been entered into the item database.

Some items are indicated that they ship using the US postal system's flat rate boxes.
Flat rate shipping has 3 different costs depending on the size of the box.
In the item's description the specific type of flat mail box is indicated.

When any buyer goes to Estimate Shipping they are presented with 3 well identified flat rates, one for each flat rate box type used (small/medium/large).
I am using the "flat_rate_clone" to do this. Buyers are also presented with the standard, weight-zip code driven estimator.
In an attempt to clear up confusion I have included some information and directions at the top of the Shipping Estimator page.

Ideally I would like to be able to implement some conditional logic to control what is displayed (is selectable) in the Shipping Estimator, but I think that is not possible. If that is the situation, I would like to be able to display in a text fashion, the Flat Rate option, from the product page itself, and bring it along to the Shipping Estimator and most importantly, to "Step 1 of 3 - Delivery Information" in The Checkout Process.

Any help, suggestions or advice will be greatly appreciated.
Thanks.

http://www.antenen.com/htdocs/teststore/index.php
Zen Cart 1.3.0.1
Database Patch Level: 1.3.0.2
All security patches have been installed.

Flat Rate USPS Example:
http://www.antenen.com/htdocs/teststore/index.php?main_page=product_info&products_id=338

Weight UPS Example:
http://www.antenen.com/htdocs/teststore/index.php?main_page=product_info&products_id=327